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Fair Value of Assets and Liabilities - Narrative (Details)
Mar. 31, 2020
debt_security
Fair Value, Inputs, Level 1  
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]  
Fair value measurement, number of debt securities 2
Fair Value, Inputs, Level 2  
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]  
Fair value measurement, number of debt securities 4